That tutorial will fix your issue if you bricked when installing preloader/priiloader. If you didn't brick with Priiloader then please provide more info so we can help you.

Please provide all the following info (if possible):

How do you think this error/brick happened?
What SM and region are you on?
Do you have Bootmii as boot2? (drive light blinks 2x)
Can you access Priiloader/Preloader? (Hold reset while powering on)
Does the error happen after health warning screen or before?
If no Bootmii or Priiloader, see if you can access recovery mode with Savemiifrii
Did you softmod with a guide from this site? If so, please provide a link to the tutorial.

Answering all this will give us the info needed to help you unbrick your system.

Cogita ante salis

If you're happy with the help I provided, don't forget to hit my thanks button